/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.protocols.ss7.cap.service.circuitSwitchedCall.primitive;

import java.io.IOException;
import java.util.ArrayList;

import org.mobicents.protocols.asn.AsnException;
import org.mobicents.protocols.asn.AsnInputStream;
import org.mobicents.protocols.asn.AsnOutputStream;
import org.mobicents.protocols.asn.Tag;
import org.mobicents.protocols.ss7.cap.api.CAPException;
import org.mobicents.protocols.ss7.cap.api.CAPParsingComponentException;
import org.mobicents.protocols.ss7.cap.api.CAPParsingComponentExceptionReason;
import org.mobicents.protocols.ss7.cap.api.service.circuitSwitchedCall.primitive.VariableMessage;
import org.mobicents.protocols.ss7.cap.api.service.circuitSwitchedCall.primitive.VariablePart;
import org.mobicents.protocols.ss7.cap.primitives.CAPAsnPrimitive;

/**
 * 
 * @author sergey vetyutnev
 * 
 */
public class VariableMessageImpl implements VariableMessage, CAPAsnPrimitive {

	public static final int _ID_elementaryMessageID = 0;
	public static final int _ID_variableParts = 1;

	public static final String _PrimitiveName = "VariableMessage";

	private int elementaryMessageID;
	private ArrayList<VariablePart> variableParts;
	
	
	public VariableMessageImpl() {
	}
	
	public VariableMessageImpl(int elementaryMessageID, ArrayList<VariablePart> variableParts) {
		this.elementaryMessageID = elementaryMessageID;
		this.variableParts = variableParts;
	}
	
	@Override
	public int getElementaryMessageID() {
		return elementaryMessageID;
	}

	@Override
	public ArrayList<VariablePart> getVariableParts() {
		return variableParts;
	}

	@Override
	public int getTag() throws CAPException {
		return Tag.SEQUENCE;
	}

	@Override
	public int getTagClass() {
		return Tag.CLASS_UNIVERSAL;
	}

	@Override
	public boolean getIsPrimitive() {
		return false;
	}

	@Override
	public void decodeAll(AsnInputStream ansIS) throws CAPParsingComponentException {

		try {
			int length = ansIS.readLength();
			this._decode(ansIS, length);
		} catch (IOException e) {
			throw new CAPParsingComponentException("IOException when decoding " + _PrimitiveName + ": " + e.getMessage(), e,
					CAPParsingComponentExceptionReason.MistypedParameter);
		} catch (AsnException e) {
			throw new CAPParsingComponentException("AsnException when decoding " + _PrimitiveName + ": " + e.getMessage(), e,
					CAPParsingComponentExceptionReason.MistypedParameter);
		}
	}

	@Override
	public void decodeData(AsnInputStream ansIS, int length) throws CAPParsingComponentException {

		try {
			this._decode(ansIS, length);
		} catch (IOException e) {
			throw new CAPParsingComponentException("IOException when decoding " + _PrimitiveName + ": " + e.getMessage(), e,
					CAPParsingComponentExceptionReason.MistypedParameter);
		} catch (AsnException e) {
			throw new CAPParsingComponentException("AsnException when decoding " + _PrimitiveName + ": " + e.getMessage(), e,
					CAPParsingComponentExceptionReason.MistypedParameter);
		}
	}

	private void _decode(AsnInputStream ansIS, int length) throws CAPParsingComponentException, IOException, AsnException {

		this.elementaryMessageID = 0;
		this.variableParts = null;
		boolean elementaryMessageIDFound = false;

		AsnInputStream ais = ansIS.readSequenceStreamData(length);
		while (true) {
			if (ais.available() == 0)
				break;

			int tag = ais.readTag();

			if (ais.getTagClass() == Tag.CLASS_CONTEXT_SPECIFIC) {
				switch (tag) {
				case _ID_elementaryMessageID:
					this.elementaryMessageID = (int) ais.readInteger();
					elementaryMessageIDFound = true;
					break;
				case _ID_variableParts:
					this.variableParts = new ArrayList<VariablePart>();

					AsnInputStream ais2 = ais.readSequenceStream();
					while (true) {
						if (ais2.available() == 0)
							break;

						ais2.readTag();
						VariablePartImpl val = new VariablePartImpl();
						val.decodeAll(ais2);
						this.variableParts.add(val);
					}
					break;

				default:
					ais.advanceElement();
					break;
				}
			} else {
				ais.advanceElement();
			}
		}

		if (this.variableParts == null || !elementaryMessageIDFound)
			throw new CAPParsingComponentException("Error while decoding " + _PrimitiveName
					+ ": elementaryMessageID and variableParts are mandatory but not found", CAPParsingComponentExceptionReason.MistypedParameter);
	}

	@Override
	public void encodeAll(AsnOutputStream asnOs) throws CAPException {
		this.encodeAll(asnOs, this.getTagClass(), this.getTag());
	}

	@Override
	public void encodeAll(AsnOutputStream asnOs, int tagClass, int tag) throws CAPException {

		try {
			asnOs.writeTag(tagClass, this.getIsPrimitive(), tag);
			int pos = asnOs.StartContentDefiniteLength();
			this.encodeData(asnOs);
			asnOs.FinalizeContent(pos);
		} catch (AsnException e) {
			throw new CAPException("AsnException when encoding " + _PrimitiveName + ": " + e.getMessage(), e);
		}
	}

	@Override
	public void encodeData(AsnOutputStream aos) throws CAPException {

		if (this.variableParts == null)
			throw new CAPException("Error while encoding " + _PrimitiveName + ": variableParts must not be null");
		if (this.variableParts.size() < 1 || this.variableParts.size() > 5)
			throw new CAPException("Error while encoding " + _PrimitiveName + ": variableParts size must not be from 1 to 5, found: "
					+ this.variableParts.size());

		try {
			aos.writeInteger(Tag.CLASS_CONTEXT_SPECIFIC, _ID_elementaryMessageID, this.elementaryMessageID);

			aos.writeTag(Tag.CLASS_CONTEXT_SPECIFIC, false, _ID_variableParts);
			int pos = aos.StartContentDefiniteLength();
			for (VariablePart val : this.variableParts) {
				if (val == null)
					throw new CAPException("Error while encoding " + _PrimitiveName + ": the variableParts array has null values");
				((VariablePartImpl) val).encodeAll(aos);
			}
			aos.FinalizeContent(pos);

		} catch (IOException e) {
			throw new CAPException("IOException when encoding " + _PrimitiveName + ": " + e.getMessage(), e);
		} catch (AsnException e) {
			throw new CAPException("AsnException when encoding " + _PrimitiveName + ": " + e.getMessage(), e);
		}
	}

	@Override
	public String toString() {

		StringBuilder sb = new StringBuilder();
		sb.append(_PrimitiveName);
		sb.append(" [");
		
		sb.append("elementaryMessageID=");
		sb.append(elementaryMessageID);
		if (this.variableParts != null) {
			sb.append(", variableParts=[");
			for (VariablePart val : this.variableParts) {
				if (val != null) {
					sb.append("variablePart=[");
					sb.append(val.toString());
					sb.append("], ");
				}
			}
			sb.append("]");
		}

		sb.append("]");

		return sb.toString();
	}
}

